Difference between revisions of "LlDetectedTouchST"

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m (damn typos)
m (fixed wording to be more clear in the comments of the scripts)
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|examples=
|examples=
<lsl>
<lsl>
//  touchST.x goes across from the left to the right
//  touchST.x goes across the face from the left to the right
//  touchST.y goes up from the bottom to the top
//  touchST.y goes across the face from the bottom to the top
//  ZERO_VECTOR (<0.0, 0.0, 0.0> ... the origin) is in the bottom left corner
//  ZERO_VECTOR (<0.0, 0.0, 0.0> ... the origin) is in the bottom left corner of the face


default
default
Line 40: Line 40:
         else if (touchST == TOUCH_INVALID_TEXCOORD)
         else if (touchST == TOUCH_INVALID_TEXCOORD)
//      {
//      {
             llWhisper(PUBLIC_CHANNEL, "Sorry, the surface touch position could not be determined.");
             llWhisper(PUBLIC_CHANNEL, "Sorry, the touch position upon the face could not be determined.");
//      }
//      }
         else
         else
Line 52: Line 52:
</lsl>
</lsl>
<lsl>
<lsl>
//  touchST.x goes across from the left to the right
//  touchST.x goes across the face from the left to the right
//  touchST.y goes up from the bottom to the top
//  touchST.y goes across the face from the bottom to the top
//  ZERO_VECTOR (<0.0, 0.0, 0.0> ... the origin) is in the bottom left corner
//  ZERO_VECTOR (<0.0, 0.0, 0.0> ... the origin) is in the bottom left corner of the face


integer numberOfRows = 12;
integer numberOfRows = 12;
Line 68: Line 68:
         integer cellIndex = (rowIndex * numberOfColums) + columnIndex;
         integer cellIndex = (rowIndex * numberOfColums) + columnIndex;


         llSay(PUBLIC_CHANNEL, "(" + (string)columnIndex + ", " + (string)rowIndex + ") --> " + (string)cellIndex);
         llSay(PUBLIC_CHANNEL, "ST (" + (string)columnIndex + ", " + (string)rowIndex + ") --> " + (string)cellIndex);
     }
     }
}
}
</lsl>
</lsl>
<lsl>
<lsl>
//  touchST.x goes across from the left to the right
//  touchST.x goes across the face from the left to the right
//  touchST.y goes up from the bottom to the top
//  touchST.y goes across the face from the bottom to the top
//  ZERO_VECTOR (<0.0, 0.0, 0.0> ... the origin) is in the bottom left corner
//  ZERO_VECTOR (<0.0, 0.0, 0.0> ... the origin) is in the bottom left corner of the face
//
//
//  with friendly permission of Supremius Maximus
//  with friendly permission of Supremius Maximus

Revision as of 14:27, 8 November 2012

Summary

Function: vector llDetectedTouchST( integer index );

Returns a vector that is the surface coordinates for where the prim was touched. The x & y vector positions contain the horizontal (s) & vertical (t) face coordinates respectively (<s, t, 0.0>). Each component is in the interval [0.0, 1.0] with the origin in the bottom left corner.[1]

TOUCH_INVALID_TEXCOORD is returned when the surface coordinates cannot be determined. See Caveats for further details.

• integer index – Index of detection information

index does not support negative indexes. For the touch category of events only. The prim that was touched may not be the prim receiving the event, use llDetectedLinkNumber to check for this; likewise you can use llDetectedTouchFace to determine which face was touched.

Caveats

  • If index is out of bounds the script continues to execute without an error message.
  • TOUCH_INVALID_TEXCOORD is returned when...
    • The avatar's viewer does not support face touch detection.
    • The touch has moved off the surface of the prim.
    • The touch happened too close to the edge of the face to determine a location.
    • The event triggered is not a touch event.
All Issues ~ Search JIRA for related Bugs

Examples

<lsl> // touchST.x goes across the face from the left to the right // touchST.y goes across the face from the bottom to the top // ZERO_VECTOR (<0.0, 0.0, 0.0> ... the origin) is in the bottom left corner of the face

default { 

   touch_start(integer total_number)
   {
       integer touchFace = llDetectedTouchFace(0);
       vector touchST = llDetectedTouchST(0);
       float touchS = touchST.x;
       float touchT = touchST.y;

       if (touchFace == -1)

// { // PUBLIC_CHANNEL has the integer value 0 

           llWhisper(PUBLIC_CHANNEL, "Sorry, your viewer doesn't support touched faces.");

// } // TOUCH_INVALID_TEXCOORD has the vector value <-1.0, -1.0, 0.0> 

       else if (touchST == TOUCH_INVALID_TEXCOORD)

// { 

           llWhisper(PUBLIC_CHANNEL, "Sorry, the touch position upon the face could not be determined.");

// } 

       else

// { 

           llSay(PUBLIC_CHANNEL, "llDetectedTouchST(" + (string)touchST + ")"
                   + "\ntouchST.x = " + (string)touchS
                   + "\ntouchST.y = " + (string)touchT);

// } 

   }

} </lsl> <lsl> // touchST.x goes across the face from the left to the right // touchST.y goes across the face from the bottom to the top // ZERO_VECTOR (<0.0, 0.0, 0.0> ... the origin) is in the bottom left corner of the face

integer numberOfRows = 12; integer numberOfColumns = 12;

default { 

   touch_start(integer total_number)
   {
       vector touchST = llDetectedTouchST(0);
       integer columnIndex = llFloor(touchST.x * numberOfColumns);
       integer rowIndex = llFloor(touchST.y * numberOfRows);
       integer cellIndex = (rowIndex * numberOfColums) + columnIndex;

       llSay(PUBLIC_CHANNEL, "ST (" + (string)columnIndex + ", " + (string)rowIndex + ") --> " + (string)cellIndex);
   }

} </lsl> <lsl> // touchST.x goes across the face from the left to the right // touchST.y goes across the face from the bottom to the top // ZERO_VECTOR (<0.0, 0.0, 0.0> ... the origin) is in the bottom left corner of the face // // with friendly permission of Supremius Maximus // who made the texture used in this script // // click&hold the mouse while dragging across // the face of the prim

default { 

   touch(integer num_detected)
   {
       integer face = llDetectedTouchFace(0);
       vector touchST = llDetectedTouchST(0);

       string uuid = "23badbe7-6d8c-639b-0131-bb321f8e9db5";

       llSetLinkPrimitiveParamsFast(LINK_THIS, [
           PRIM_TEXTURE, face, uuid, <1.0, 1.0, 0.0>, touchST, (float)FALSE,
           PRIM_FULLBRIGHT, ALL_SIDES, TRUE]);
   }

}

</lsl>

See Also

Deep Notes

History

Introduced in Viewer SVN:870 r92872 Branch:Release Wednesday, 23 July 2008, Supported by Beta Server 1.24.0.93754 (Wenesday 6th August 2008), and viewer binary 1.20.15 (93532).
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Footnotes

  1. ^ The ranges in this article are written in Interval Notation.

Signature

function vector llDetectedTouchST( integer index );
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